[Bug 208533] devel/libdap: Fix build with libc++ 3.8.0

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=208533

            Bug ID: 208533
           Summary: devel/libdap: Fix build with libc++ 3.8.0
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: sunpoet at FreeBSD.org
          Reporter: dim at FreeBSD.org
          Assignee: sunpoet at FreeBSD.org
             Flags: maintainer-feedback?(sunpoet at FreeBSD.org)

Created attachment 168984
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=168984&action=edit
Disable custom max_align_t definition for devel/libdap

During the exp-run in bug 208158, it was found that devel/libdap gives errors
with libc++ 3.8.0 [1]:

In file included from ./gl/wchar.h:73:
./gl/stddef.h:104:3: error: typedef redefinition with different types ('union
max_align_t' vs 'long double')
} max_align_t;
  ^
/usr/include/c++/v1/stddef.h:57:21: note: previous definition is here
typedef long double max_align_t;
                    ^
1 error generated.

This is because libdap contains a gl/stddef.h, which tries to fix possible
omissions in the standard stddef.h header.  Unfortunately, this clashes in C++
mode with the stddef.h from libc++.  Fix this similarly to bug 208175, by
telling the configure script that the system already has max_align_t, through
setting ac_cv_type_max_align_t=yes.

[1]
http://package18.nyi.freebsd.org/data/headamd64PR208158-default/2016-03-22_18h30m05s/logs/errors/libdap-3.17.0.log

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